Flying net projectile

Abstract

The invention provides a flying net projectile. The flying net projectile comprises a head shell case, a tail shell case and a flying net assembly. The head cartridge case and the tail cartridge case are buckled to form a constraint cavity, and the windward side of the head cartridge case is provided with an air hole array communicated with the constraint cavity; the flying net assembly comprises a flexible net piece and a plurality of traction elastic pieces, and the flexible net piece is connected with the traction elastic pieces through traction wires. The traction elastic pieces are distributed in the restraining cavity in a circumferential array mode, and an elastic element is arranged between every two adjacent traction elastic pieces. Wherein the head cartridge case and the tail cartridge case are separated under the compression of air flow entering the restraint cavity through the air hole array, and when the head cartridge case and the tail cartridge case are separated, the traction elastic pieces drive the flexible meshes to be opened under the elastic pushing action of the elastic elements. According to the flying net projectile provided by the invention, the separation opportunity of the head shell and the tail shell can be associated with the flying speed of the flying net projectile, so that the projectile structure can be greatly simplified, and the interception stroke and precision can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air defense equipment, and particularly relates to a net projectile. Background Art

[0002] Non-lethal weapons have great application prospects in the fields of maintaining stability, handling emergencies, riot control, anti-terrorism, etc. Among them, the net projectile is a non-lethal shooting projectile aimed at intercepting and capturing aerial targets such as unmanned aerial vehicles and birds. Most of the existing net projectiles adopt a deployment structure similar to a parachute, and are launched from the gun barrel by gunpowder or gas and deployed after leaving the gun barrel to entangle the aerial target. The principle of net deployment is usually based on the material properties of the cartridge case itself or the impact force of internal electronic devices on the cartridge case, causing the cartridge case to break and release the net. Currently, such net projectiles have the disadvantages of short effective interception range, complex control structure for the net opening timing, and poor stability, and still need further innovation and development. Summary of the Invention

[0003] An embodiment of the present invention provides a net projectile, aiming to simplify the structure of the net projectile and improve its effective interception range and the accuracy of the running trajectory.

[0004] To achieve the above object, the technical solution adopted by the present invention is: providing a net projectile, including a head cartridge case, a tail cartridge case and a net assembly; the head cartridge case and the tail cartridge case are buckled to form a constraint cavity, and an air hole array communicated with the constraint cavity is arranged on the windward surface of the head cartridge case; the net assembly includes a flexible net sheet and multiple petal-shaped traction elastic sheets, and the flexible net sheet and each petal-shaped traction elastic sheet are respectively connected by traction lines; each petal-shaped traction elastic sheet is distributed in a circumferential array in the constraint cavity, and an elastic element is arranged between adjacent traction elastic sheets; wherein, the head cartridge case and the tail cartridge case are separated under the oppression of the air flow entering the constraint cavity through the air hole array, and when the head cartridge case and the tail cartridge case are separated, each petal-shaped traction elastic sheet drives the flexible net sheet to open under the elastic pushing action of the elastic element.

[0005] In a possible implementation manner, each petal-shaped traction elastic sheet forms a columnar structure based on the radial pressing action of the inner wall of the constraint cavity, one end of the columnar structure is in plug-in fit with the head cartridge case, and the other end is in plug-in fit with the tail cartridge case; wherein, the plug-in force between the head cartridge case and the columnar structure is greater than or equal to the plug-in force between the tail cartridge case and the columnar structure. When the head cartridge case and the tail cartridge case are separated, the tail cartridge case disengages from the columnar structure prior to the head cartridge case or both disengage from the columnar structure simultaneously.

[0006] In some embodiments, a first compression cavity is formed between the inner end wall of the columnar structure and the tail cartridge case, a second compression cavity is formed between the inner end of the columnar structure and the head cartridge case, and the flexible net sheet is folded and accommodated in the first compression cavity or the second compression cavity; wherein, an air flow channel is formed in the center of the columnar structure, and the first compression cavity and the second compression cavity are communicated through the air flow channel.

[0007] Exemplarily, the air flow channel is in the shape of a tapered hole, and the end of the air flow channel facing the second pressing cavity is the large-diameter end, and the other end is the small-diameter end.

[0008] For example, a connecting rod is provided at the center of the inner end wall of the tail cartridge case. The connecting rod axially penetrates through the air flow channel along the axial direction of the cylindrical structure, and the diameter of the connecting rod is smaller than the diameter of the small-diameter end. The end of the connecting rod penetrating into the air flow channel forms a limiting head, and the diameter of the limiting head is larger than the diameter of the small-diameter end; wherein, before the tail cartridge case disengages from the cylindrical structure, there is always an annular gap between the limiting head and the air flow channel.

[0009] In a possible implementation manner, the limiting head includes a guiding conical surface and a limiting conical surface axially connected along the connecting rod; wherein, the guiding conical surface faces the second pressing cavity, and the limiting conical surface is used to press against the inner wall of the air flow channel when the tail cartridge case disengages from the cylindrical structure.

[0010] In some embodiments, blind holes are provided on the side wall of the traction elastic sheet, and the blind holes of adjacent traction elastic sheets are axially aligned and jointly accommodate an elastic element.

[0011] Exemplarily, the net projectile is used to rotate and shoot out of the gun barrel under the guidance of the rifling; wherein, when the head cartridge case and the tail cartridge case are separated, each petal of the traction elastic sheet forms a spiral divergence trajectory based on the elastic pushing action and the rotational centrifugal action to drive the flexible net to open.

[0012] The beneficial effect of a net projectile provided by the present invention is that: compared with the prior art, in a net projectile of the present invention, the head cartridge case and the tail cartridge case are buckled to form a constraint cavity for accommodating the net assembly. When shooting out of the gun barrel and obtaining high-speed movement, air flow can enter the constraint cavity through the air hole array provided on the windward surface of the head cartridge case, so that the internal air pressure of the constraint cavity increases. At the same time, a negative pressure is formed at the rear end of the high-speed flying tail cartridge case based on the Bernoulli effect. As a result, the tail cartridge case and the head cartridge case are separated due to the pressure difference caused by the air flow pressing, so that the net assembly disengages from the constraint cavity. Each petal of the traction elastic sheet then spreads along the circumferential direction of the constraint cavity under the elastic pushing action of the elastic element, so as to drive the flexible net to quickly unfold and effectively intercept and capture an aerial target; since the net assembly is released by means of the air flow pressing during the flight process, the separation timing of the head cartridge case and the tail cartridge case can be associated with the flight speed of the net projectile. This can not only greatly simplify the structure of the projectile, but also enable the net projectile to still fly in an overall posture after leaving the gun barrel, and when approaching the aerial target, the head cartridge case and the tail cartridge case are separated to release the net assembly, thereby increasing the effective interception range and avoiding the premature release of the net assembly from affecting the running trajectory, thus improving the interception accuracy. Description of the Drawings

[0013] Figure 1Schematic diagram of the three-dimensional structure of a net projectile provided by an embodiment of the present invention; Figure 2 Schematic diagram of the explosion structure of a net projectile provided by an embodiment of the present invention; Figure 3 Schematic diagram of the divergent decomposition structure of the traction shrapnel adopted by an embodiment of the present invention; Figure 4 Schematic diagram of the buckling structure of the head cartridge case and the tail cartridge case adopted by an embodiment of the present invention; Figures 5 to 8 Schematic diagram of the disassembly process of a net projectile provided by another embodiment of the present invention.

[0014] In the figure: 10, head cartridge case; 11, air hole array; 20, tail cartridge case; 21, connecting rod; 22, limiting head; 221, guiding conical surface; 222, limiting conical surface; 30, net assembly; 31, flexible mesh; 32, traction shrapnel; 321, blind hole; 33, traction line; 34, elastic element; 40, constraint cavity; 41, first compression cavity; 42, second compression cavity; 43, air flow channel; 431, annular gap. Detailed implementation manners

[0015] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] It should be noted that when an element is referred to as being "disposed on" or "connected to" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "front", "rear", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or several of such features. In the description of the present application, the meaning of "a plurality" or "several" is two or more, unless otherwise specifically defined.

[0017] Please refer to Figures 1 to 4, a flying net projectile provided by the present invention will be described hereinafter. The flying net projectile includes a head cartridge case 10, a tail cartridge case 20 and a flying net assembly 30; the head cartridge case 10 and the tail cartridge case 20 are buckled to form a constraint cavity 40, and an air hole array 11 communicating with the constraint cavity 40 is provided on the windward surface of the head cartridge case 10; the flying net assembly 30 includes a flexible net sheet 31 and a plurality of petal-shaped traction elastic sheets 32, and the flexible net sheet 31 and each petal-shaped traction elastic sheet 32 are respectively connected by a traction wire 33; each petal-shaped traction elastic sheet 32 is distributed in a circumferential array in the constraint cavity 40, and an elastic element 34 is provided between adjacent traction elastic sheets 32; wherein, the head cartridge case 10 and the tail cartridge case 20 are separated under the pressure of the air flow entering the constraint cavity 40 through the air hole array 11, and when the head cartridge case 10 and the tail cartridge case 20 are separated, each petal-shaped traction elastic sheet 32 drives the flexible net sheet 31 to open under the elastic pushing action of the elastic element 34.

[0018] It should be noted that in this embodiment, the head cartridge case 10 is a conical shell, and the tail cartridge case 20 is a cylindrical shell. The two can be directly buckled and connected, or they can be respectively inserted into the flying net assembly 30 to achieve the closed docking of the two to form a sealed constraint cavity 40; the traction elastic sheet 32 can specifically be a quarter-cylindrical structure. Thus, four petal-shaped traction elastic sheets 32 can enclose to form a cylinder adapted to the constraint cavity 40. The flexible net sheet 31 adopts a square structure, and each net corner thereof is connected to the end of one of the petal-shaped traction elastic sheets 32 through a traction wire 33; the elastic element 34 can specifically be a spring. When the head cartridge case 10 and the tail cartridge case 20 are separated and the flying net assembly 30 is separated from the constraint cavity 40, at this time, the traction elastic sheets 32 are elastically pushed apart from each other under the action of the elastic element 34, thereby driving the flexible net sheet 31 to unfold.

[0019] Specifically, during the continuous acceleration of the flying net projectile provided in this embodiment after being fired from the gun barrel, the air flow enters the interior of the constraint cavity 40 through the air hole array 11 opened on the windward surface of the head cartridge case 10. After the air flow enters the constraint cavity 40, on the one hand, it forms an air flow impact on the flying net assembly 30 and the tail cartridge case 20, and on the other hand, it causes the internal air pressure of the constraint cavity 40 to continuously increase. In addition, a negative pressure is formed in the rear region of the tail cartridge case 20 based on the Bernoulli effect during the high-speed flight of the flying net projectile, and the faster the speed, the higher the negative pressure. When the speed of the flying net projectile reaches the maximum value, the air flow impact force, the internal air pressure of the constraint cavity 40, and the negative pressure at the rear end of the tail cartridge case 20 all reach the highest. At this time, the buckling force between the head cartridge case 10 and the tail cartridge case 20 or the insertion force between the two and the flying net assembly 30 reaches the limit and separates, causing the flying net assembly 30 to separate from the constraint cavity 40. At the same time, each traction elastic sheet 32 quickly disperses in all directions under the elastic pushing action of the elastic element 34 and pulls the flexible net sheet 31 to unfold to intercept and capture an aerial target.

[0020] A flying net projectile provided in this embodiment, compared with the prior art, the head cartridge case 10 and the tail cartridge case 20 are buckled to form a constraint cavity 40 for accommodating the flying net assembly 30. When the projectile obtains high-speed movement after being fired from the gun barrel, air flow can enter the constraint cavity 40 through the air hole array 11 provided on the windward surface of the head cartridge case 10, so that the internal air pressure of the constraint cavity 40 increases. At the same time, a negative pressure is formed at the rear end of the high-speed flying tail cartridge case 20 based on the Bernoulli effect. As a result, the tail cartridge case 20 and the head cartridge case 10 are separated due to the pressure difference caused by the air flow pressure, so that the flying net assembly 30 is separated from the constraint cavity 40. Each flap traction piece 32 spreads out circumferentially along the inner wall of the constraint cavity 40 under the elastic pushing action of the elastic element 34, so as to drive the flexible net piece 31 to quickly unfold and effectively intercept and capture an aerial target; since the flying net assembly 30 is released by means of the air flow pressure during the flight process, the separation timing of the head cartridge case 10 and the tail cartridge case 20 can be associated with the flight speed of the flying net projectile. This can not only greatly simplify the projectile structure, but also enable the flying net projectile to still fly in an overall posture after leaving the barrel, and when approaching the aerial target, the head cartridge case 10 and the tail cartridge case 20 are separated to release the flying net assembly 30, thereby increasing the effective interception range, and can avoid the premature release of the flying net assembly 30 from affecting the flight trajectory, thus improving the interception accuracy.

[0021] In some embodiments, referring to Figure 2 and Figure 3 , each flap traction piece 32 forms a cylindrical structure under the radial pressing action of the inner wall of the constraint cavity 40. One end of the cylindrical structure is in plug-in fit with the head cartridge case 10, and the other end is in plug-in fit with the tail cartridge case 20; wherein, the plug-in force between the head cartridge case 10 and the cylindrical structure is greater than or equal to the plug-in force between the tail cartridge case 20 and the cylindrical structure. When the head cartridge case 10 and the tail cartridge case 20 are separated, the tail cartridge case 20 disengages from the cylindrical structure prior to the head cartridge case 10 or both disengage from the cylindrical structure simultaneously.

[0022] Due to the elastic pushing action of the elastic element 34, each petal traction spring piece 32 has an expansion force within the constraint cavity 40. Therefore, an insertion state is formed between the cylindrical structure composed of each petal traction spring piece 32 and the head cartridge case 10 and the tail cartridge case 20. The greater the elastic force of the elastic element 34, the greater the insertion force. Thus, the step generated by the butt joint connection between the head cartridge case 10 and the tail cartridge case 20 can be avoided, thereby improving the circumferential wall flatness after the head cartridge case 10 and the tail cartridge case 20 are buckled, reducing the air resistance and increasing the flight speed of the net projectile, and further contributing to improving the flight trajectory accuracy; when the net projectile reaches the maximum speed, the head cartridge case 10 and the tail cartridge case 20 are separated based on the internal and external pressure difference of the constraint cavity 40 and the airflow impact. Here, the insertion force between the head cartridge case 10 and the cylindrical structure can be set to be greater than the insertion force between the tail cartridge case 20 and the cylindrical structure, so that the tail cartridge case 20 separates from the cylindrical structure prior to the head cartridge case 10, or the insertion force between the head cartridge case 10 and the tail cartridge case 20 and the cylindrical structure can be the same, so that the two separate from the cylindrical structure simultaneously. Thus, the problem that the tail cartridge case 20 fails to disengage after the head cartridge case 10 separates from the cylindrical structure first (after the head cartridge case 10 separates from the cylindrical structure, the constraint cavity 40 has been opened, and at this time, the airflow passing through the air hole array 11 will not be able to exert a pressing effect between the cylindrical structure and the tail cartridge case 20, and if the tail cartridge case 20 disengages first, the airflow passing through the air hole array 11 can still continuously press the cylindrical structure to drive the head cartridge case 10 to separate) can be avoided, thereby improving the release stability of the net assembly 30.

[0023] It should be noted that, please refer to Figures 5 to 8 , a first compression cavity 41 is formed between the cylindrical structure and the inner end wall of the tail cartridge case 20, a second compression cavity 42 is formed between the cylindrical structure and the inner end of the head cartridge case 10, and the flexible mesh sheet 31 is folded and accommodated in the first compression cavity 41 or the second compression cavity 42; wherein, an air flow channel 43 is formed at the center of the cylindrical structure, and the first compression cavity 41 and the second compression cavity 42 are communicated through the air flow channel 4,

[0024] The air flow passes through the pore array 11 and enters the second compression chamber 42, and then enters the first compression chamber 41 through the air flow channel 43, so that both the head cartridge case 10 and the tail cartridge case 20 can obtain the air flow compression effect. And because the first compression chamber 41 and the second compression chamber 42 are connected based on the air flow channel 43, that is to say, the first compression chamber 41, the second compression chamber 42 and the air flow channel 43 together form the space inside the constraint cavity 40 for accommodating air. As the air pressure in this space gradually increases, finally when the flying speed of the net projectile is the maximum, the tail cartridge case 20 and the head cartridge case 10 are separated. And because the insertion force between the tail cartridge case 20 and the columnar structure is greater than or equal to the insertion force between the head cartridge case 10 and the columnar structure, so the tail cartridge case 20 separates from the columnar structure before the head cartridge case 10 or both separate from the columnar structure at the same time, thereby improving the release stability of the net assembly 30, so as to realize the precise control of the deployment timing of the flexible net 31 and improve the success rate of the net intercepting the aerial target.

[0025] As a specific implementation manner of the above air flow channel 43, please refer to Figures 5 to 7 , the air flow channel 43 is in the shape of a tapered hole, and the end of the air flow channel 43 facing the second compression chamber 42 is the large-diameter end, and the other end is the small-diameter end. The function of adopting the tapered hole for the air flow channel 43 is that on the one hand, it can make the flow velocity of the air flow in the air flow channel 43 gradually increase during the process of the air flow entering the second compression chamber 42 from the second compression chamber 42, so as to increase the impact force of the air flow on the tail cartridge case 20 and ensure that the tail cartridge case 20 separates from the columnar structure before the head cartridge case 10. On the other hand, it can make the air flow form a radial compression force on the inner wall of the air flow channel 43 during the process of passing through the air flow channel 43, so that when the columnar structure separates from both the head cartridge case 10 and the tail cartridge case 20, each petal traction spring 32 is quickly dispersed under the combined action of the elastic top thrust of the elastic element 34 and the radial compression force of the air flow, thereby improving the deployment speed and deployment effect of the flexible net 31 and avoiding the situation that the flexible net 31 cannot be completely deployed due to insufficient elastic top thrust of the elastic element 34, so as to improve the interception and capture success rate of the flexible net 31 for the aerial target.

[0026] In some possible implementation manners, please refer to Figures 5 to 7 , for the situation where the tail cartridge case 20 separates from the columnar structure before the head cartridge case 10, a connecting rod 21 is provided at the center of the inner end wall of the tail cartridge case 20. The connecting rod 21 axially penetrates through the air flow channel 43 along the columnar structure, and the diameter of the connecting rod 21 is smaller than the diameter of the small-diameter end. The end of the connecting rod 21 penetrating into the air flow channel 43 forms a limiting head 22, and the diameter of the limiting head 22 is larger than the diameter of the small-diameter end; wherein, before the tail cartridge case 20 separates from the columnar structure, there is always an annular gap 431 between the limiting head 22 and the air flow channel 43.

[0027] The air flow enters the second compression chamber 42 through the pore array 11 and then enters the first compression chamber 41 by using the annular gap 431 between the limit head 22 and the air flow channel 43. When the tail cartridge case 20 is separated from the columnar structure, the connecting rod 21 generates an axial displacement relative to the air flow channel 43 and abuts against the inner wall of the small-diameter end of the air flow channel 43 by using the limit head 22. On the one hand, the limit head 22 forms a directional impact on the air flow channel 43. On the other hand, the limit head 22 blocks the air flow channel 43. The air flow continuously impacts the inner wall of the air flow channel 43 and the limit head 22, so that the columnar structure obtains the air flow impact force. On the other hand, after the tail cartridge case 20 is separated from the columnar structure, a state with an open front end can obtain a large air resistance. Combining these three acting forces can enable the columnar structure to be quickly separated from the head cartridge case 10, thereby improving the release reliability of the net assembly 30 and increasing the interception and capture success rate of the aerial target object.

[0028] As a specific structure of the above-mentioned limit head 22, please refer to Figures 5 to 7 , the limit head 22 includes a flow guiding conical surface 221 and a limit conical surface 222 that are axially connected along the connecting rod 21; wherein, the flow guiding conical surface 221 faces the second compression chamber 42, and the limit conical surface 222 is used to press against the inner wall of the air flow channel 43 when the tail cartridge case 20 is separated from the columnar structure. The flow guiding conical surface 221 can guide the air flow into the annular gap 431 and flow in the air flow channel 43, reducing the air flow resistance, so as to ensure the flow rate of the air flow entering the first compression chamber 41 and the impact force of the air flow on the tail cartridge case 20; and the limit conical surface 222 is arranged to abut against the inner wall of the air flow channel 43 after the tail cartridge case 20 is separated from the columnar structure, which can not only ensure that the tail cartridge case 20 still maintains the coaxiality with the head cartridge case 10, thus avoiding affecting the overall flight trajectory of the net bullet after the tail cartridge case 20 is separated, but also can improve the sealing tightness of the air flow channel 43 by the contact between the limit conical surface 222 and the inner wall of the air flow channel 43, so as to ensure the impact force of the air flow on the columnar structure after the tail cartridge case 20 is separated from the columnar structure, and further improve the separation reliability between the head cartridge case 10 and the columnar structure.

[0029] It should be understood that, please refer to Figure 8 , in this embodiment, the side wall of the traction spring piece 32 is provided with a blind hole 321, and the blind holes 321 of adjacent traction spring pieces 32 are axially aligned and jointly accommodate the elastic element 34. By arranging the blind hole 321 to accommodate the elastic element 34, the side walls of the traction spring pieces 32 can be tightly abutted to form a columnar structure, thereby improving the installation stability of the traction spring pieces 32 inside the constraint cavity 40, and further ensuring the uniform dispersion of each lobe of the traction spring pieces 32 after the constraint cavity 40 releases the net assembly 30, thereby increasing the success rate of the net intercepting and capturing the aerial target object.

[0030] It should be noted that, please refer to Figure 8, the above-mentioned net projectile is used to rotate and shoot out of the gun barrel under the guidance of rifling; wherein, when the head cartridge case 10 and the tail cartridge case 20 are separated, each petal traction piece 32 forms a spiral divergent trajectory based on the elastic pushing action and the rotational centrifugal action to drive the flexible net piece 31 to open. Here, using the gun barrel for firing conventional projectiles in the existing technology can drive the net projectile to shoot out in a rotating posture by the rifling on the inner wall of the gun barrel. On the one hand, it can improve the flight attitude stability and flight trajectory accuracy of the net projectile. On the other hand, after the head cartridge case 10 and the tail cartridge case 20 are separated to release the net assembly 30, the net assembly 30 can continue to rotate under the action of rotational inertia force. At the same time, each petal traction piece 32 diverges under the elastic pushing action of the elastic element 34, so that the flexible net piece 31 obtains a process of spiral divergent unfolding, thereby improving the flight trajectory accuracy of the flexible net piece 31 during continued flight after unfolding.

[0031] In addition, it should be understood that based on the rotational movement of the net projectile, each petal traction piece 32 mainly bears the elastic pushing action at the initial stage of divergence. When each petal traction piece 32 is separated, the elastic pushing force gradually disappears and it is mainly affected by the rotational centrifugal force and continues to diverge until the flexible net piece 31 is completely unfolded. And after the flexible net piece 31 is unfolded, it can continuously bear the traction action generated by each petal traction piece 32 based on the rotational centrifugal force, so that the flexible net piece 31 can intercept the aerial target in a good unfolding posture. On this basis, after the flexible net piece 31 contacts the aerial target, each petal traction piece 32 can traction the edge of the flexible net piece 31 to continuously rotate, so that the edge of the flexible net piece 31 winds around the aerial target to prevent the aerial target from getting out of control. The success rate of intercepting and capturing the control target, especially for unmanned aerial vehicle (UAV) - type targets, can be greatly improved compared with the existing interception methods.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flying net projectile, characterized in that, It includes a head cartridge case, a tail cartridge case and a flying net assembly; the head cartridge case and the tail cartridge case are buckled to form a constraint cavity, and an air hole array communicating with the constraint cavity is arranged on the windward surface of the head cartridge case; The flying net assembly includes a flexible net piece and multiple lobed traction elastic pieces, and the flexible net piece is respectively connected to each lobed traction elastic piece through a traction wire; each lobed traction elastic piece is distributed in a circumferential array in the constraint cavity, and an elastic element is arranged between adjacent traction elastic pieces; Wherein, the head cartridge case and the tail cartridge case are separated under the pressure of the air flow entering the constraint cavity through the air hole array, and when the head cartridge case and the tail cartridge case are separated, each lobed traction elastic piece drives the flexible net piece to open under the elastic pushing action of the elastic element.

2. The flying net projectile according to claim 1, characterized in that, Each lobed traction elastic piece forms a cylindrical structure based on the radial pressing action of the inner wall of the constraint cavity, one end of the cylindrical structure is in plug-in fit with the head cartridge case, and the other end is in plug-in fit with the tail cartridge case; Wherein, the plug-in force between the head cartridge case and the cylindrical structure is greater than or equal to the plug-in force between the tail cartridge case and the cylindrical structure. When the head cartridge case and the tail cartridge case are separated, the tail cartridge case disengages from the cylindrical structure before the head cartridge case or both disengage from the cylindrical structure simultaneously.

3. The flying net projectile according to claim 2, characterized in that, A first compression cavity is formed between the inner end wall of the cylindrical structure and the tail cartridge case, and a second compression cavity is formed between the inner end of the cylindrical structure and the head cartridge case. The flexible net piece is folded and accommodated in the first compression cavity or the second compression cavity; wherein, an air flow channel is formed in the center of the cylindrical structure, and the first compression cavity and the second compression cavity are communicated through the air flow channel.

4. A flying net projectile according to claim 3, characterized in that, The air flow channel is in a conical hole shape, and the end of the air flow channel facing the second compression cavity is the large diameter end, and the other end is the small diameter end.

5. A flying net projectile according to claim 4, characterized in that, A connecting rod is arranged at the center of the inner end wall of the tail cartridge case, the connecting rod axially penetrates through the air flow channel along the cylindrical structure, and the diameter of the connecting rod is smaller than the diameter of the small diameter end. The end of the connecting rod penetrating into the air flow channel forms a limiting head, and the diameter of the limiting head is greater than the diameter of the small diameter end; Wherein, before the tail cartridge case disengages from the cylindrical structure, there is always an annular gap between the limiting head and the air flow channel.

6. The flying net bullet according to claim 5, characterized in that, The limiting head includes a guiding conical surface and a limiting conical surface connected axially along the connecting rod; wherein, the guiding conical surface faces the second compression cavity, and the limiting conical surface is used for pressing against the inner wall of the air flow channel when the tail cartridge case disengages from the cylindrical structure.

7. A flying net projectile according to claim 1, characterized in that, Blind holes are arranged on the side walls of the traction elastic pieces, and the blind holes of adjacent traction elastic pieces are axially aligned and jointly accommodate the elastic element.

8. A flying net projectile according to any one of claims 1-7, characterized in that, The flying net bullet is used to rotate and shoot out of the gun barrel under the guidance of the spiral rifling; wherein, when the head cartridge case and the tail cartridge case are separated, each lobed traction elastic piece forms a spiral divergent trajectory based on the elastic pushing action and the rotational centrifugal action to drive the flexible net piece to open.

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